Screw connection



Sept. 12, 1939. w. HEYNER ET AL SCREW CONNECTION Filed NOV. 15, 1938 Patented Sept. 1-2, 1939 UNITED STATES,

' SCREW CONNECTION Heyner and Hermann Henkel, Berlindbl,

Application November 15, 19:8. serial No. 246.4

In Germany April 21, 1938 a 1 Claim. (a; as-ao Our invention relates to screw connections serving to enable thin plates, for instance, plywood sheets, sheets of linoleum and other composite material, leather and the like, to be con- 5 nected with other parts by screwing.

In our copending application for Letters Patent of the United States Serial No. 168,041 ffiled October 8, 1937, we have described a screw connection consisting of two parts, an. internally 1 threaded female part, or nut and a sleeve adapted to be fixed, by interaction with that female part, in a hole or perforation of the plate or sheet and I in its turn to retain the female part therein.-

In the drawing affixed to thistspecification and 15 forming part thereof we have illustrated diagrammatically by way of examplean embodiment of a screw connection according to our invention and of a tool serving to fix the parts in place.

In the drawing: t Fig. 1 is an axial section of the screw connection and the toolin the position of the parts,.i.n which the tool is prepared for the fixing of the screw connection in a wooden plate.

Fig. 2 is a similar view, showing the parts in 25 the position afterth'e screwconnectionhas been fixed in the,plate. I

Fig. 3 is an enlarged view of the outer partor sleeve of the screw connection and 'a tool serving to expandthe edge portion thereof, while Fig. 4 isa plan view of a modified form of the inner part or nut,

Fig. 5 a similar view of the outer partor sleeve after fixation in the wood and v Fig. 6 an axial section showing the two parts 35 of the screw, connection fixed in a wooden plate. Referring to the drawing and first to Figs. 1 to 3-, I4 is. a metal sleeve formed at one end with a thin edged part I5. 12 is a-nut formed at one end with a flange II and fitting in the'sleeve ll. 40 when a conical tool such as 22 (Fig, is forced into the sleeve II from the thin ed part II.- this part will be expanded,;heing subdivided into' a number. of separate tongues. If the sleeve is pow placed on the nut II th thethin expanded I 45 part lS-facing the l3 and axialpressure v is exerted'on the sleeve ll, the tongues will be spread by the wedge action of the flange l3 and will enterttge wood or other material, in which so Inordertofixthepartsinplaoe.theyar e placed in an excayation of the sheet of wood,

. linoleum, leather or the like and the tool shown in Figs. 1. and 2 is mounted above them. This tool is formed of'a strong hollow metal cylinder I '55 closed ontop'and-formed with abroadfiange It at the 'bottom.'which is designed todistribute the pressure on a-- large surface of the wood, leather or the. like. Above the, cylinder I is mounted another cylinder 4 formed with a head I and seated in a cylinder 2 with-perforated bot- 5 tom. Through the perforations of' this bottom and the cover of cylinder I extend four steel pins 5, which carry the bottom edge'of the cylinder 4. and rest onianother cylinder I seated in the cylinder l for axial movement, which is limited by a pin ll forming a check and extending into an axial groove ll of-cylinder 9. Into the cyl-'- inder 9 extends a bolt seated in a central hole in the cover of cylinder l M retained therein by a top flange II. An extension I of the bolt 3 15 is formed at its bottom end with screw threadling a which fits in the screw threadingof the nut l2;

In order to fix the.parts l2 and I4 in place in the wood, linoleum or the like. the nut I! carrying the sleeve I4 .is screwed onto the threaded. end I of the bolt extension I and the tool I, 2- is placed? on top of the cavity serving to receive the parts [2, II, which now extend into this cavity,

as shown in Fig. 1. By a blow of the hammer striking the head 3, the pins [will force the cylinder. I downwardly and the bottom face of this 4 cylinder, resting on the sleeve ll, will force the sleeve downwardly, whereby the tongues forming part 'of the thin edged portion of sleeve ll are spread in glidlngon' the flange l3, being thus driven into the wallrofthe excavation, as shown in Fig. 2. These tongues now firmlyfix' the hit I! in position in this excavation.

r In orderto prevent the combined parts of the screw connection from turning in this excavation, we prefer forming the flange ll of the sleeve I! with two opposite notches II, each notch being so dimensioned as to allow one of me tongues to pass through without being forced 40 aside. Consequently, when the sleeve is driven down, two tongues 1| will enter the material of the plate orthe like belowthe excavation 2! as showninl 'igsjandtwhiletheotherwnm l laarespreadsidewaysasshown inl'ig.4. The

nt flisnowprevented fromturninginthe eeve by theJongues II which extend intothe notchesflofthenut a that wedo not wewlsh ittobeunderstood desiretobeiimitedtotheexactdetailsofcon-m struction shown and described for obvious modificationswilloccurtoapersonskilledinthe Wecla lm:. v

A screw connection adapted tobe fixed-in thinplatesofsoftmaterial comprisingincom- 56 bination, an Internally threaded tubular sleeve forming a nut, a flange at one end of said tubular sleeve formed with a cam face and an outer tubular sleeve snugly fitting said nutand formed at one end with a thin edged slitted annular portion adapted to be expanded. when it is fo'roed axially onto the cam-heed flange, the flange on the nut being formed with a, notch enabling part of the thin-edged slitted portion of the outer sleeve to escape deformation when the sleeve is forced down upon said flange.

W'IILIHEYNER. HEBMANNHENKEL- 

